Liquid-crystalline copolymer

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EP 0 355 772 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	17.07.1991 Bulletin 1991/29

(43)	Date of publication A2:
	28.02.1990 Bulletin 1990/09

(21)	Application number: 89115384.3

(22)	Date of filing: 21.08.1989

(51)	International Patent Classification (IPC)⁵: C09K 19/38, C08G 65/00, C08G 65/22, C07D 303/22

(84)	Designated Contracting States:
	BE CH DE FR GB IT LI NL SE

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Priority:

26.08.1988 JP 210659/88
05.09.1988 JP 220411/88

(71)	Applicant: IDEMITSU KOSAN COMPANY LIMITED
	Tokyo 100 (JP)

(72)	Inventors:
	Uchida, Shunji c/o Idemitsu Kosan Co., Ltd. Kimitsu-gun Chiba-ken (JP) Hachiya, Satoshi c/o Idemitsu Kosan Co., Ltd. Kimitsu-gun Chiba-ken (JP) Hashimoto, Kenji c/o Idemitsu Kosan Co., Ltd. Kimitsu-gun Chiba-ken (JP)

(74)	Representative: Strehl Schübel-Hopf Groening & Partner
	Maximilianstrasse 54 80538 München 80538 München (DE)

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References cited: :

(54)	Liquid-crystalline copolymer

(57) A liquid-crystalline copolymer having a long helical pitch, the liquid-crystalline copolymer comprises the copolymerization product of;

(a) at least one liquid-crystalline epoxy compound having a helical structure and

(b) at least one liquid-crystalline epoxy compound having a helical structure opposite in twining direction of helix to the helical structure of the liquid-crystalline epoxy compound (a) or

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